The liquid-amorphous phase transition, slow dynamics and dynamical heterogeneity for bulk iron: a molecular dynamics simulation.

Based on molecular dynamics (MD) simulations, we investigate the liquid-amorphous phase transition, slow dynamic and dynamical heterogeneity (DH) for bulk iron in temperatures ranging 300-2300 K. The structure of obtained models is explored through the pair radial distribution function (PRDF) and simplex statistics. It was shown that the splitting of a PRDF second peak appears when the liquid transforms to an amorphous solid. This feature is originated from the transformation of simplexes from strongly-to weakly-distorted tetrahedron type. Further, we reveal that the diffusivity in the liquid is realized through the local density fluctuations (LDF) which are strongly correlated with each other. The diffusion coefficient is found to be a product of the rate of LDF act and mean square displacement of particles per LDF act. The later quantity mainly contributes to the slow dynamics and DH in the liquid. We found that the mobile atom clusters move during relaxation time, but mobile atoms do not tend to leave their cluster. Our work is expected to contribute a pathway to determine the liquid-amorphous phase transition and DH heterogeneity of bulk metal.

Study of using mitomycine in the prevention of adhesion formation affter endoscopic sinus surgery

A prospective study was carried out on 32 patients in order to assess effect of mitomycine C in the prevention of adhesion formation after endoscopic sinus surgery on high-risk patients. The risk factors of post-operative adhesion included narrow nasal passages (9%), recurrent sinusitis with obstructive scar (22%). 88% mucous membrane was normal 6 months after surgery, 6% was mild adhesion after surgery. Results: administration of mitomycine C 0,04mg on the surface of sinus mucous membrane within 4 minutes, it showed high effectiveness of post-operative anti-adhesion in high-risk patients. There wasn’t any complication

The endoscopic septoplasty technique a propos of 86 consecutive cases at Nhandan hospital HCMC

Nasal septum deviation is one of the most common anatomic variants in nasal region. The deviated septum causes nasal dysfunction or affects cosmetic appearance call for septoplasty surgery. Thanks for its ability in approaching and managing the affected nasal tissues. The endoscopes technique has effectively applicated on septoplasty. Since 1999, Gia Dinh – Nhan dan Hospital HCM city have carried out the technique for 86 consecutive surgical patients. The results show the efficacy of this technique in managing little spurs or ridges on nasal septum. In managing more complicated or post traumatic nasal septum deviation, the Killian technique would be much more appropriate